Vernonia weather by month
What a typical year looks like in Vernonia, Oregon: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Vernonia No. 2, 1 km from Vernonia; records cover 1967–2026.
The year at a glance
- Precipitation a year
- 48 in1220 mm
- Snow a year
- 1.1 in2.8 cm
- Last spring freeze
- May 9
- First fall freeze
- Sep 29
- Heating degree days
- 5,773
- Cooling degree days
- 84
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 17°−8° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Vernonia in January
Highs average 46°8° and lows 32°0°, with 6.9 in176 mm of precipitation and 0.3 in0.8 cm of snow in a typical January.
- Record high
- 66°19° (1968)
- Record low
- −2°−19° (1979)
- Heating degree days
- 817
- Cooling degree days
- 0
Vernonia in February
Highs average 49°10° and lows 31°−1°, with 5.3 in136 mm of precipitation and 0.6 in1.5 cm of snow in a typical February.
- Record high
- 72°22° (1968)
- Record low
- −6°−21° (1989)
- Heating degree days
- 696
- Cooling degree days
- 0
Vernonia in March
Highs average 54°12° and lows 34°1°, with 5.3 in135 mm of precipitation in a typical March.
- Record high
- 81°27° (2025)
- Record low
- 13°−11° (1971)
- Heating degree days
- 665
- Cooling degree days
- 0
Vernonia in April
Highs average 59°15° and lows 36°2°, with 3.7 in95 mm of precipitation in a typical April.
- Record high
- 89°32° (2016)
- Record low
- 22°−6° (1975)
- Heating degree days
- 537
- Cooling degree days
- 0
Vernonia in May
Highs average 66°19° and lows 40°5°, with 2.4 in61 mm of precipitation in a typical May.
- Record high
- 99°37° (1983)
- Record low
- 27°−3° (2001)
- Heating degree days
- 377
- Cooling degree days
- 2
Vernonia in June
Highs average 70°21° and lows 44°7°, with 1.4 in37 mm of precipitation in a typical June.
- Record high
- 111°44° (2021)
- Record low
- 30°−1° (1991)
- Heating degree days
- 244
- Cooling degree days
- 8
Vernonia in July
Highs average 77°25° and lows 47°8°, with 0.39 in9.9 mm of precipitation in a typical July.
- Record high
- 104°40° (2009)
- Record low
- 33°1° (2009)
- Heating degree days
- 119
- Cooling degree days
- 33
Vernonia in August
Highs average 78°26° and lows 47°8°, with 0.55 in14 mm of precipitation in a typical August.
- Record high
- 103°39° (2021)
- Record low
- 32°0° (1973)
- Heating degree days
- 109
- Cooling degree days
- 33
Vernonia in September
Highs average 73°23° and lows 43°6°, with 1.8 in45 mm of precipitation in a typical September.
- Record high
- 103°39° (1988)
- Record low
- 23°−5° (2000)
- Heating degree days
- 218
- Cooling degree days
- 8
Vernonia in OctoberThis month
Highs average 61°16° and lows 38°3°, with 4.1 in105 mm of precipitation in a typical October.
- Record high
- 93°34° (1987)
- Record low
- 10°−12° (2002)
- Heating degree days
- 470
- Cooling degree days
- 0
Vernonia in November
Highs average 51°10° and lows 34°1°, with 7.7 in196 mm of precipitation in a typical November.
- Record high
- 73°23° (1980)
- Record low
- 2°−17° (1985)
- Heating degree days
- 678
- Cooling degree days
- 0
Vernonia in December
Highs average 44°7° and lows 31°0°, with 8.3 in212 mm of precipitation and 0.2 in0.5 cm of snow in a typical December.
- Record high
- 64°18° (2022)
- Record low
- −7°−22° (1990)
- Heating degree days
- 843
- Cooling degree days
- 0